Derivatives and Hedge Accounting Activities (Selected Information Related to Gains (Losses) on Cash Flow Hedges Included in AOCI) (Details) (USD $) In Millions, unless otherwise specified	9 Months Ended
	Sep. 30, 2014
Derivative Instruments, Gain (Loss) [Line Items]
AOCI After-Tax	$ (442)
Amounts Expected to be Reclassified to Earnings during the next 12 Months After-Tax	(197)
Commodity | Gas Energy Contract
Derivative Instruments, Gain (Loss) [Line Items]
AOCI After-Tax	(4)
Amounts Expected to be Reclassified to Earnings during the next 12 Months After-Tax	(4)
Maximum Term	19 months
Commodity | Electricity Energy Contract
Derivative Instruments, Gain (Loss) [Line Items]
AOCI After-Tax	(252)
Amounts Expected to be Reclassified to Earnings during the next 12 Months After-Tax	(188)
Maximum Term	27 months
Commodity | Other Energy Contract
Derivative Instruments, Gain (Loss) [Line Items]
AOCI After-Tax	1
Amounts Expected to be Reclassified to Earnings during the next 12 Months After-Tax	1
Maximum Term	20 months
Interest rate
Derivative Instruments, Gain (Loss) [Line Items]
AOCI After-Tax	(187)
Amounts Expected to be Reclassified to Earnings during the next 12 Months After-Tax	(6)
Maximum Term	360 months
Dominion Gas Holdings, LLC
Derivative Instruments, Gain (Loss) [Line Items]
AOCI After-Tax	(19)
Amounts Expected to be Reclassified to Earnings during the next 12 Months After-Tax	(3)
Dominion Gas Holdings, LLC | Commodity | Natural Gas
Derivative Instruments, Gain (Loss) [Line Items]
AOCI After-Tax	(3)
Amounts Expected to be Reclassified to Earnings during the next 12 Months After-Tax	(3)
Maximum Term	6 months
Dominion Gas Holdings, LLC | Commodity | NGLs
Derivative Instruments, Gain (Loss) [Line Items]
AOCI After-Tax	0
Amounts Expected to be Reclassified to Earnings during the next 12 Months After-Tax	0
Maximum Term	3 months
Dominion Gas Holdings, LLC | Interest rate
Derivative Instruments, Gain (Loss) [Line Items]
AOCI After-Tax	(16)
Amounts Expected to be Reclassified to Earnings during the next 12 Months After-Tax	$ 0
Maximum Term	360 months